KEY-FinalExamStudyGuide_Fall2013

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Name ___________________________ Date ___________________ Class __________________ 8 COVALENT BONDING SECTION 8.1 MOLECULAR COMPOUNDS (pages 213–216) This section explains how to distinguish between ionic and molecular compounds. Molecules and Molecular Compounds (pages 213–214) 1. What is a covalent bond? A covalent bond is a bond formed when two atoms share electrons. 2. Most elements found in nature, with the exception of the ______________________ noble gases , exist as molecules. 3. What is a molecule? A molecule is a neutral group of atoms joined together by covalent bonds. 4. Compounds that are formed when two or more atoms combine to form molecules are called ______________________ molecular compounds . 5. Circle the letter of the substances that do NOT exist as molecules in nature. a. oxygen © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. b. water c. neon d. ozone e. helium 6. List two properties of molecular compounds. a. low melting and boiling points b. exist as gases or liquids at room temperature Chapter 8 Covalent Bonding 69
Name ___________________________ Date ___________________ Class __________________ CHAPTER 8, Covalent Bonding (continued) Molecular Formulas (pages 215–216) 7. What is a molecular formula? A molecular formula shows the types and numbers of atoms present in a molecule of a compound. Match each compound with its molecular formula. _______ b 8. carbon dioxide a. C 2 H 6 _______ a 9. ethane b. CO 2 _______10. c ammonia c. NH 3 11. Is the following sentence true or false? A molecular formula shows the arrangement of the atoms in a molecule. ______________________ false In the diagram, match the type of model or formula with its representation. a. ball-and-stick model d. space-filling molecular model b. molecular formula e. structural formula c. perspective drawing NH 3 (g) 12. _______________ b N H H H N H H H 14. _______________ d H N H H 15. _______________ c H N H H 13. _______________ a 16. _______________ e 17. What is the arrangement of atoms within a molecule called? ___________________________ molecular structure © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. 70 Guided Reading and Study Workbook
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KEY-FinalExamStudyGuide_Fall2013

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